Kate GosselinMoves to Hold Jon in Contempt

1/10/2011 7:40 PM PST

Kate Gosselin Moves to Hold Jon in Contempt

We've learned Kate's lawyers filed a Petition for Contempt of Custody Order last Thursday.

Sources connected with the case tell TMZ ... Kate believes Jon is squarely violating the judge's custody order -- prohibiting either of them from talking about the case -- by allegedly selling information about the case and tweeting his displeasure of the judge's various decisions.

We're told Kate is claiming Jon is willfully disobeying the orders, mostly to make a buck, and she wants the judge to modify the custody agreement to protect the kids from their alleged money-grubbing dad.